Providing comprehensive smoking cessation care to surgical patients: the case for computers

Barriers and facilitators to perioperative smoking cessation: A scoping review

OBJECTIVE

Smoking cessation interventions are underutilized in the surgical setting. We aimed to systematically identify the barriers and facilitators to smoking cessation in the surgical setting.

METHODS

Following the Joanna Briggs Institute (JBI) framework for scoping reviews, we searched 5 databases (MEDLINE, Embase, Cochrane CENTRAL, CINAHL, and PsycINFO) for quantitative or qualitative studies published in English (since 2000) evaluating barriers and facilitators to perioperative smoking cessation interventions. Data were analyzed using thematic analysis and mapped to the theoretical domains framework (TDF).

RESULTS

From 31 studies, we identified 23 unique barriers and 13 facilitators mapped to 11 of the 14 TDF domains. The barriers were within the domains of knowledge (e.g., inadequate knowledge of smoking cessation interventions) in 23 (74.2%) studies; environmental context and resources (e.g., lack of time to deliver smoking cessation interventions) in 19 (61.3%) studies; beliefs about capabilities (e.g., belief that patients are nervous about surgery/diagnosis) in 14 (45.2%) studies; and social/professional role and identity (e.g., surgeons do not believe it is their role to provide smoking cessation interventions) in 8 (25.8%) studies. Facilitators were mainly within the domains of environmental context and resources (e.g., provision of quit smoking advice as routine surgical care) in 15 (48.4%) studies, reinforcement (e.g., surgery itself as a motivator to kickstart quit attempts) in 8 (25.8%) studies, and skills (e.g., smoking cessation training and awareness of guidelines) in 5 (16.2%) studies.

CONCLUSION

The identified barriers and facilitators are actionable targets for future studies aimed at translating evidence informed smoking cessation interventions into practice in perioperative settings. More research is needed to evaluate how targeting these barriers and facilitators will impact smoking outcomes.

First Nations Australians' experiences of current alcohol policy in Central Australia: evidence of self-determination?

Alcohol is the leading cause of healthy years lost. There is significant variation in alcohol consumption patterns and harms in Australia, with those residing in the Northern Territory (NT), particularly First Nations Australians, experiencing higher alcohol-attributable harms than other Australians. Community leadership in the planning and implementation of health, including alcohol, policy is important to health outcomes for First Nations Australians. Self-determination, a cornerstone of the structural and social determinants of health, is necessary in the development of alcohol-related policy. However, there is a paucity of published literature regarding Indigenous Peoples self-determination in alcohol policy development. This study aims to identify the extent to which First Nations Australians experience self-determination in relation to current alcohol policy in Alice Springs/Mbantua (Northern Territory, Australia).Semi-structured qualitative yarns with First Nations Australian community members (n = 21) were undertaken. A framework of elements needed for self-determination in health and alcohol policy were applied to interview transcripts to assess the degree of self-determination in current alcohol policy in Alice Springs/Mbantua. Of the 36 elements, 33% were not mentioned in the interviews at all, 20% were mentioned as being present, and 75% were absent. This analysis identified issues of policy implementation, need for First Nations Australian leadership, and representation.Alcohol policy for First Nations Australians in the NT is nuanced and complicated. A conscious approach is needed to recognise and implement the right to self-determination, which must be led and defined by First Nations Australians.First Nations Australians' experiences of current alcohol policy in Central Australia: evidence of self-determination?

Public Health and Health Care Partnerships for Improved Tobacco Cessation

CONTEXT

Tobacco use remains a leading cause of preventable death and disease. While most tobacco users are interested in quitting, few receive professional assistance.

PROGRAM

This state health department-led project leveraged partnerships to build capacity and support 9 health care organizations in implementing system-level initiatives to improve delivery of tobacco cessation.

IMPLEMENTATION

Participating organizations' initiatives targeted 3 focus areas: implementing best practices for tobacco cessation; quality improvement; and utilization of the electronic health record.

EVALUATION

A qualitative study was conducted to examine facilitators and barriers to tobacco cession systems change among participating health care organizations. Common barriers included time constraints, staffing issues, and organizational structure. These factors often differed by organization type (eg, large vs small). Facilitators included leadership buy-in, organizational priority, technical assistance, teams/teamwork, and IT support.

DISCUSSION

Initial findings suggest that this type of partnership model can be leveraged to gain organizational support, build capacity, address key barriers, and ensure that systems change strategies align with best practices for tobacco cessation across a diverse set of health care organizations. Findings presented in this report provide insights for other public health and health care organizations looking to implement similar initiatives.

Care-paradigm shift promoting smoking cessation treatment among cancer center patients via a low-burden strategy, Electronic Health Record-Enabled Evidence-Based Smoking Cessation Treatment

Tobacco smoking is an important risk factor for cancer incidence, an effect modifier for cancer treatment, and a negative prognostic factor for disease outcomes. Inadequate implementation of evidence-based smoking cessation treatment in cancer centers, a consequence of numerous patient-, provider-, and system-level barriers, contributes to tobacco-related morbidity and mortality. This study provides data for a paradigm shift from a frequently used specialist referral model to a point-of-care treatment model for tobacco use assessment and cessation treatment for outpatients at a large cancer center. The point-of-care model is enabled by a low-burden strategy, the Electronic Health Record-Enabled Evidence-Based Smoking Cessation Treatment program, which was implemented in the cancer center clinics on June 2, 2018. Five-month pre- and post-implementation data from the electronic health record (EHR) were analyzed. The percentage of cancer patients assessed for tobacco use significantly increased from 48% to 90% (z = 126.57, p < .001), the percentage of smokers referred for cessation counseling increased from 0.72% to 1.91% (z = 3.81, p < .001), and the percentage of smokers with cessation medication significantly increased from 3% to 17% (z = 17.20, p < .001). EHR functionalities may significantly address barriers to point-of-care treatment delivery, improving its consistent implementation and thereby increasing access to and quality of smoking cessation care for cancer center patients.

Systematic review and meta-analysis of the provision of preventive care for modifiable chronic disease risk behaviours by mental health services

People with mental illness experience increased chronic disease burden, contributed to by a greater prevalence of modifiable chronic disease risk behaviours. Policies recommend mental health services provide preventive care for such risk behaviours. Provision of such care has not previously been synthesised. This review assessed the provision of preventive care for modifiable chronic disease risk behaviours by mental health services. Four databases were searched from 2006 to 2017. Eligible studies were observational quantitative study designs conducted in mental health services, where preventive care was provided to clients for tobacco smoking, harmful alcohol consumption, inadequate nutrition, or inadequate physical activity. Two reviewers independently screened studies, conducted data extraction and critical appraisal. Results were pooled as proportions of clients receiving or clinicians providing preventive care using random effects meta-analyses, by risk behaviour and preventive care element (ask/assess, advise, assist, arrange). Subgroup analyses were conducted by mental health service type (inpatient, outpatient, other/multiple). Narrative synthesis was used where meta-analysis was not possible. Thirty-eight studies were included with 26 amenable to meta-analyses. Analyses revealed that rates of assessment were highest for smoking (78%, 95% confidence interval [CI]:59%-96%) and lowest for nutrition (17%, 95% CI:1%-35%); with variable rates of care provision for all behaviours, care elements, and across service types, with substantial heterogeneity across analyses. Findings indicated suboptimal and variable provision of preventive care for modifiable chronic disease risk behaviours in mental health services, but should be considered with caution due to the very low quality of cumulative evidence. PROSPERO registration: CRD42016049889.

Prevent 2nd Stroke: a pilot study of an online secondary prevention program for stroke survivors

OBJECTIVE

The prevalence of modifiable health risk factors and psychological distress following a stroke is high and markedly increase the chance of a second stroke. This study aimed to examine the usability and acceptability of an online secondary prevention program addressing modifiable psycho-behavioural risk factors for stroke survivors.

METHODS

A pre-post pilot study was conducted in Australia between 2016 and 2017. Participants were recruited through the Australian Stroke Clinical Registry and completed measures of health-related quality of life, physical activity, smoking status, depression and anxiety, alcohol status, nutrition and internet use. Participants also used an online secondary prevention program (Prevent 2^nd Stroke) over a two-week period. At follow-up, acceptability and usability of the program were assessed.

RESULTS

A total of 18 out of 19 participants reported engaging in multiple health risk behaviours. Participants reported that they were interested in receiving an online program that provided health information (73.7%). Participants indicated Prevent 2^nd Stroke was easy to use (63.1%) and that they would recommend the program to other stroke survivors (63.1%).

CONCLUSIONS

The results indicated that online programs are an acceptable way to address these health outcomes. Implications to public health: Further research is needed to assess the effectiveness of these interventions using powered trials.

Smoke-Free Recovery from Trauma Surgery: A Pilot Trial of an Online Smoking Cessation Program for Orthopaedic Trauma Patients

Smoking increases the risk of complications associated with orthopaedic trauma surgery, however delivery of care is low. Online interventions may provide needed smoking cessation care and promote abstinence. This study aims to examine the engagement, acceptability, and retention of an online smoking cessation program (Smoke-Free Recovery; SFR) among a sample of orthopaedic trauma patients, as well as themes around the smoking cessation process. A pilot study of SFR with 31 orthopaedic trauma patients admitted to a public hospital in New South Wales, Australia took place. Semi-structured telephone interviews were conducted following hospital discharge. Thematic analysis and descriptive statistics were used. Engagement was high with 28 participants accessing SFR during admission. Twenty individuals completed follow-up phone calls. Program acceptability was rated favourably. After discharge, changes in smoking habits were noted, with program retention low. Themes on program use included: lack of time or need for additional support; computer illiteracy or technology issues; feeling unready or too stressed to quit; or feeling they had reached the boundary of what could be learnt from the program. This study highlights the difficulties faced by patients following hospital admission, the lack of follow-up support received, and the need for consumer testing prior to roll out. Continuing to develop interventions to promote hospital-initiated cessation attempts that continue post-discharge should be a priority.

Who is More Likely to Use the Internet for Health Behavior Change? A Cross-Sectional Survey of Internet Use Among Smokers and Nonsmokers Who Are Orthopedic Trauma Patients

BACKGROUND

eHealth presents opportunities to provide population groups with accessible health interventions, although knowledge about Internet access, peoples' interest in using the Internet for health, and users' characteristics are required prior to eHealth program development.

OBJECTIVE

This study surveyed hospital patients to examine rates of Internet use, interest in using the Internet for health, and respondent characteristics related to Internet use and interest in using the Internet for health. For patients who smoke, preferences for types of smoking cessation programs for use at home and while in hospital were also examined.

METHODS

An online cross-sectional survey was used to survey 819 orthopedic trauma patients (response rate: 72.61%, 819/1128) from two public hospitals in New South Wales, Australia. Logistic regressions were used to examine associations between variables.

RESULTS

A total of 72.7% (574/790) of respondents had at least weekly Internet access and more than half (56.6%, 357/631) reported interest in using the Internet for health. Odds of at least weekly Internet usage were higher if the individual was born overseas (OR 2.21, 95% CI 1.27-3.82, P=.005), had a tertiary education (OR 3.75, 95% CI 2.41-5.84, P<.001), or was a nonsmoker (OR 3.75, 95% CI 2.41-5.84, P<.001). Interest in using the Internet for health increased with high school (OR 1.85, 95% CI 1.09-3.15, P=.02) or tertiary education (OR 2.48, 95% CI 1.66-3.70, P<.001), and if household incomes were more than AUS $100,000 (OR 2.5, 95% CI 1.25-4.97, P=.009). Older individuals were less interested in using the Internet for health (OR 0.98, 95% CI 0.97-0.99, P<.001).

CONCLUSIONS

Online interventions may be a potential tool for health care in this hospitalized population.

TRIAL REGISTRATION

Australian New Zealand Clinical Trials Registry (ANZCTR): ACTRN12614001147673; https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=366829&isReview=true (Archived by WebCite at http://www.webcitation.org/6qg26u3En).

System change interventions for smoking cessation

BACKGROUND

System change interventions for smoking cessation are policies and practices designed by organizations to integrate the identification of smokers and the subsequent offering of evidence-based nicotine dependence treatments into usual care. Such strategies have the potential to improve the provision of smoking cessation support in healthcare settings, and cessation outcomes among those who use them.

OBJECTIVES

To assess the effectiveness of system change interventions within healthcare settings, for increasing smoking cessation or the provision of smoking cessation care, or both.

SEARCH METHODS

We searched databases including the Cochrane Tobacco Addiction Group Specialized Register, CENTRAL, MEDLINE, Embase, CINAHL, and PsycINFO in February 2016. We also searched clinical trial registries: WHO clinical trial registry, US National Institute of Health (NIH) clinical trial registry. We checked 'grey' literature, and handsearched bibliographies of relevant papers and publications.

SELECTION CRITERIA

Randomized controlled trials (RCTs), cluster-RCTs, quasi-RCTs and interrupted time series studies that evaluated a system change intervention, which included identification of all smokers and subsequent offering of evidence-based nicotine dependence treatment.

DATA COLLECTION AND ANALYSIS

Using a standardized form, we extracted data from eligible studies on study settings, participants, interventions and outcomes of interest (both cessation and system-level outcomes). For cessation outcomes, we used the strictest available criteria to define abstinence. System-level outcomes included assessment and documentation of smoking status, provision of advice to quit or cessation counselling, referral and enrolment in quitline services, and prescribing of cessation medications. We assessed risks of bias according to the Cochrane Handbook and categorized each study as being at high, low or unclear risk of bias. We used a narrative synthesis to describe the effectiveness of the interventions on various outcomes, because of significant heterogeneity among studies.

MAIN RESULTS

We included seven cluster-randomized controlled studies in this review. We rated the quality of evidence as very low or low, depending on the outcome, according to the GRADE standard. Evidence of efficacy was equivocal for abstinence from smoking at the longest follow-up (four studies), and for the secondary outcome 'prescribing of smoking cessation medications' (two studies). Four studies evaluated changes in provision of smoking cessation counselling and three favoured the intervention. There were significant improvements in documentation of smoking status (one study), quitline referral (two studies) and quitline enrolment (two studies). Other secondary endpoints, such as asking about tobacco use (three studies) and advising to quit (three studies), also indicated some positive effects.

AUTHORS' CONCLUSIONS

The available evidence suggests that system change interventions for smoking cessation may not be effective in achieving increased cessation rates, but have been shown to improve process outcomes, such as documentation of smoking status, provision of cessation counselling and referral to smoking cessation services. However, as the available research is limited we are not able to draw strong conclusions. There is a need for additional high-quality research to explore the impact of system change interventions on both cessation and system-level outcomes.

Smoking cessation strategies for patients with asthma: improving patient outcomes

Smoking is common in adults with asthma, yet a paucity of literature exists on smoking cessation strategies specifically targeting this subgroup. Adverse respiratory effects from personal smoking include worse asthma control and a predisposition to lower lung function and chronic obstructive pulmonary disease. Some data suggest that individuals with asthma are more likely than their non-asthmatic peers to smoke regularly at an earlier age. While quit attempts can be more frequent in smokers with asthma, they are also of shorter duration than in non-asthmatics. Considering these asthma-specific characteristics is important in order to individualize smoking cessation strategies. In particular, asthma-specific information such as "lung age" should be provided and longer-term follow-up is advised. Promising emerging strategies include reminders by cellular phone and web-based interventions using consumer health informatics. For adolescents, training older peers to deliver asthma education is another promising strategy. For smokers who are hospitalized for asthma, inpatient nicotine replacement therapy and counseling are a priority. Overall, improving smoking cessation rates in smokers with asthma may rely on a more personalized approach, with the potential for substantial health benefits to individuals and the population at large.

Integrating smoking cessation into routine care in hospitals--a randomized controlled trial

AIMS

To evaluate the effectiveness of a pharmacist-led multi-component smoking cessation programme (GIVE UP FOR GOOD) compared with usual care in hospitalized smokers.

DESIGN

Randomized, assessor-blinded, parallel-group trial.

SETTING

Three tertiary public hospitals in Australia.

PARTICIPANTS

A total of 600 adult in-patient smokers [mean ± standard deviation (SD), age 51 ± 14 years; 64% male] available for 12 months follow-up.

INTERVENTIONS

Multi-component hospital pharmacist-led behavioural counselling and/or pharmacotherapy provided during hospital stay, on discharge and 1 month post-discharge, with further support involving community health professionals (n = 300). Usual care comprised routine care provided by hospitals (n = 300).

MEASUREMENTS

Two primary end-points were tested using intention-to-treat analysis: carbon monoxide (CO)-validated 1-month sustained abstinence at 6-month follow-up and verified 6-month sustained abstinence at 12-month follow-up. Smoking status and pharmacotherapy usage were assessed at baseline, discharge, 1, 6 and 12 months.

FINDINGS

Sustained abstinence rates for intervention and control groups were not significantly different at both 6 months [11.6% (34 of 294) versus 12.6% (37 of 294); odds ratio (OR) = 0.91, 95% confidence interval (CI) = 0.55-1.50] and 12 months [11.6% (34 of 292) versus 11.2% (33 of 294); OR = 1.04, 95% CI = 0.63-1.73]. Secondary end-points, self-reported continuous abstinence at 6 and 12 months, also agreed with the primary end-points. Use of pharmacotherapy was higher in the intervention group, both during hospital stay [52.3% (157 of 300) versus 42.7% (128 of 300); P = 0.016] and after discharge [59.6% (174 of 292) versus 43.5% (128 of 294); P < 0.001].

CONCLUSIONS

A pharmacist-led multi-component smoking cessation intervention provided during hospital stay did not improve sustained abstinence rates at either 6 or 12 months compared with routine hospital care.

Mental health clinician attitudes to the provision of preventive care for chronic disease risk behaviours and association with care provision

BACKGROUND

Preventive care for chronic disease risk behaviours by mental health clinicians is sub-optimal. Little research has examined the association between clinician attitudes and such care delivery. This study aimed to explore: i) the attitudes of a multi-disciplinary group of community mental health clinicians regarding their perceived role, perception of client interest, and perceived self-efficacy in the provision of preventive care, ii) whether such attitudes differ by professional discipline, and iii) the association between these attitudes and clinician provision of such care.

METHOD

A telephone survey was conducted with 151 Australian community mental health clinicians regarding their attitudes towards provision of assessment, advice and referral addressing smoking, nutrition, alcohol, and physical activity, and their reported provision of such care. Logistic regression was used to examine the association between attitudes and care delivery, and attitudinal differences by professional discipline.

RESULTS

Most clinicians reported that: their manager supported provision of preventive care; such care was part of their role; it would not jeopardise their practitioner-client relationships, clients found preventive care acceptable, and that they had the confidence, knowledge and skills to modify client health behaviours. Half reported that clients were not interested in changing their health behaviours, and one third indicated that the provision of preventive care negatively impacted on time available for delivery of acute care. The following attitudes were positively associated with the provision of preventive care: role congruence, client interest in change, and addressing health risk behaviours will not jeopardise the client-clinician relationship.

CONCLUSIONS

Strategies are required to translate positive attitudes to improved client care and address attitudes which may hinder the provision of preventive care in community mental health.

Improving the implementation of responsible alcohol management practices by community sporting clubs: A randomised controlled trial

INTRODUCTION AND AIMS

Despite an increased prevalence of risky alcohol consumption and alcohol-related harm among members of sporting groups and at sporting venues, sporting clubs frequently fail to implement alcohol management practices consistent with liquor legislation and best practice guidelines. The aim of this study was to assess the impact of a multi-strategy intervention in improving the implementation of responsible alcohol management practices by sports clubs.

DESIGN AND METHODS

A randomised controlled trial was conducted with 87 football clubs, with half randomised to receive a multi-strategy intervention to support clubs to implement responsible alcohol management practices. The 2-year intervention, which was based on implementation and capacity building theory and frameworks, included project officer support, funding, accreditation rewards, printed resources, observational audit feedback, newsletters, training and support from state sporting organisations. Interviews were undertaken with club presidents at baseline and post-intervention to assess alcohol management practice implementation.

RESULTS

Post-intervention, 88% of intervention clubs reported implementing '13 or more' of 16 responsible alcohol management practices, which was significantly greater than the proportion of control groups reporting this level of implementation (65%) [odds ratio: 3.7 (95% confidence interval: 1.1-13.2); P = 0.04]. All intervention components were considered highly useful and three-quarters or more of clubs rated the amount of implementation support to be sufficient.

DISCUSSION AND CONCLUSIONS

The multi-strategy intervention was successful in improving alcohol management practices in community sports clubs. Further research is required to better understand implementation barriers and to assess the long-term sustainability of the change in club alcohol management practices.

A pharmacist-led system-change smoking cessation intervention for smokers admitted to Australian public hospitals (GIVE UP FOR GOOD): study protocol for a randomised controlled trial

BACKGROUND

Intensive smoking cessation interventions initiated during hospitalisation are effective, but currently not widely available. Strategies are needed to integrate smoking cessation treatment into routine inpatient care. Pharmacist-led interventions for smoking cessation are feasible and efficacious in both ambulatory and community pharmacy settings. However, there is a lack of evidence from large scale studies of the effectiveness of pharmacist guided programs initiated during patient hospitalisation in achieving long-term abstinence. This study aims to evaluate the effectiveness of a pharmacist-led system change intervention initiated during hospitalisation in Australian public hospitals.

METHODS/DESIGN

A multi-centre, randomised controlled trial will be conducted with 12 months follow-up. Smokers, 18 years or older, will be recruited from the wards of three Victorian public hospitals. Participants will be randomly assigned to a usual care or intervention group using a computer generated randomisation list. The intervention group will receive at least three smoking cessation support sessions by a trained pharmacist: the first during the hospital stay, the second on or immediately after discharge and the third within one month post-discharge. All smoking cessation medications will be provided free of charge during the hospital stay and for at least one week after discharge. Participants randomised to usual care will receive the current care routinely provided by the hospital. All measurements at baseline, discharge, one, six and 12 months will be performed by a blinded Research Assistant. The primary outcome measures are carbon monoxide validated 7-day point prevalence abstinence at six and 12 months.

DISCUSSION

This is the first large scale study to develop and test a pharmacist-led system change intervention program initiated during patient hospitalisation. If successful, the program could be considered for wider implementation across other hospitals.

TRIAL REGISTRATION

ACTRN12612000368831.

Research priorities for Article 14--demand reduction measures concerning tobacco dependence and cessation

INTRODUCTION

Tobacco dependence treatment (TDT) interventions are often seen as expensive with little impact on the prevalence of tobacco use. However, activities that promote the cessation of tobacco use and support abstinence have an important role in any comprehensive tobacco control program and as such are recognized within Article 14 (A14) of the Framework Convention on Tobacco Control.

OBJECTIVES

To review current evidence for TDT and recommend research priorities that will contribute to more people being helped to stop tobacco use.

METHODS

We used the recommendations within the A14 guidelines to guide a review of current evidence and best practice for promotion of tobacco cessation and TDT, identify gaps, and propose research priorities.

RESULTS

We identified nine areas for future research (a) understanding current tobacco use and the effect of policy on behavior, (b) promoting cessation of tobacco use, (c) implementation of TDT guidelines, (d) increasing training capacity, (e) enhancing population-based TDT interventions, (f) treatment for different types of tobacco use, (g) supply of low-cost pharmaceutical devices/ products, (h) investigation use of nonpharmaceutical devices/ products, and (i) refinement of current TDTs. Specific research topics are suggested within each of these areas and recognize the differences needed between high- and low-/middle-income countries.

CONCLUSIONS

Research should be prioritized toward examining interventions that (a) promote cessation of tobacco use, (b) assist health care workers provide better help to smokers (e.g., through implementation of guidelines and training), (c) enhance population-based TDT interventions, and (d) assist people to cease the use of other tobacco products.

Verbal information about anesthesia before scheduled surgery - contents and patient satisfaction

OBJECTIVE

The contents of information for patients before medical procedures are outlined by legislation and guidelines. The amount and form are less regulated. Our aim was to evaluate the contents of verbal information provided by anesthesiologists in a long-established preoperative clinic, and how satisfied patients are with it.

METHODS

A questionnaire based on legislation and the DISCERN quality criteria for information on treatment choices was sent to patients who recently had anesthesia for elective hysterectomy in our hospital (n=372), and to the anesthesiologists involved (n=24).

RESULTS

Preoperative information was regarded as sufficient by 82% of the patients and rated good by 65%. Information on the benefits of anesthesia, its risks, and effects on the quality of life was considered satisfactory by 74%, 49%, and 49%, respectively. Only 54% received enough information on lifestyle interventions to reduce their individual risks. Of the anesthesiologists, 33% had a policy to tell about risks on request only.

CONCLUSION

Verbal information was highly appreciated by the patients, but only two-thirds rated its quality as good, and half were satisfied with the information concerning risks.

PRACTICE IMPLICATIONS

More attention has to be focused on how to offer information on risks and self-help interventions to reduce them.